package com.dxy.netty.simpledemo;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.nio.charset.StandardCharsets;

/**
 * @Description netty客户端中的处理器
 * @Author dangxianyue
 * @Date 2023/1/3 18:13
 */
public class SimpleNettyClientHandler extends ChannelInboundHandlerAdapter {

    // 当通道就绪就会触发该方法
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("client " + ctx);
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello, 服务器", StandardCharsets.UTF_8));
    }

    // 当通道有读取事件时，会触发
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf byteBuf = (ByteBuf) msg;
        System.out.println("服务器回复消息：" + byteBuf.toString(StandardCharsets.UTF_8));
        System.out.println("服务器地址：" + ctx.channel().remoteAddress());
    }

    // 捕获异常
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
